Canadian Society for Medical Laboratory Science (CSMLS) Practice Exam

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What is used when storing picric acid?

Xylene
10% formalin
Water
Ethanol

The correct answer is: Xylene

Picric acid is a highly reactive and potentially explosive compound, especially when dry. Therefore, it is crucial to store it in a manner that reduces the risk of detonation. Xylene is an appropriate storing medium for picric acid because it functions as a non-aqueous solvent that maintains the picric acid in a stable state and prevents it from crystallizing, which can lead to dangerous conditions. Using xylene allows for effective stabilization as it keeps the concentration of the picric acid low, thus minimizing risks associated with handling and storage. This method ensures that the picric acid remains in a wet form, which is essential for safety, as dry picric acid can become highly sensitive to shock and heat. The other substances listed do not provide the appropriate conditions for storing picric acid. Formalin may chemically interact with picric acid, water can cause hydrolysis and unwanted reactions, and ethanol, while being a solvent, is not as effective for long-term storage of picric acid due to potential volatility and reactivity.